The Grey

During the final scenes there is a flipped shotWhen Ottway realizes he is in the wolf den, he turns his head from left to right and (after a cut) back to left.

The left-to-right turn is a flipped version (shot from a slightly different angle) of the right-to-left turn - this is obvious from the lesion which is on his right cheek in the flipped shot while in all other scenes it is on his left cheek.

Before setting off for the woods, Ottway searches through the plane wreckage and finds his rifle in its case, with the stock broken in two.

He then discards the rifle.

This is strange as, even with the stock broken and scope ruined, it would be possible to fire the rifle with reasonable accuracy at close range, certainly accurately enough to dispatch a number of wolves.

Late in the movie, Ottway unfolds the letter, which then shows a large yellowish stain.

Still later, he partially unfolds it before folding it into his wallet, and the stain is gone.

When Pete leaves the other two by the river, John has two pairs of white sport shoes.

But before he stops in the final scene he has two pairs of black mountain shoes.

After the plane crash Ottway is seen covered in snow, but when he gets to the plane to see the survivors there is almost no snow on his sweater.